import * as React from 'react';
import * as ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(
  // <React.StrictMode>
  <App />,
  // </React.StrictMode>
  document.getElementById('root')
);

// ReactDOM.render(
//   <div>Hello React</div>,
//   document.getElementById('root'),
//   function () {
//     console.log('render 函数第三个参数：callback this :', this); // div
//   }
// );

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: https://bit.ly/CRA-PWA
serviceWorker.unregister();
